Acer RA19WAANU Service Manual page 24

5.4 Abnormal screen for VGA
Check the R, G, B video signal from computer
Check the R, G, B input video signals on I305
pin12, 14, 16 respectively that their level is 0.0 to
Check all LVDS signals being output to P305
5. Troubleshooting (continued)
input on P302 of video connector.
NG
OK
0.7Vp-p.
NG
OK
from I305?
NG
OK
Prpcess "Checking the resolution change IC
movement" section.
Failure Point
1) No R, G, B video signals output from host
computer, check computer.
2) Video signal cable disconnection.
Failure Point
In the case of the Red signal. (A Green and Blue
signal is the same path, too.)
1) Printed wire broke between P302 pin1 and
I305 pin16.
2) Video cable is failure.
3) FB302,FB306,R327 is open.
4) R326 is short or open.
5) C315 is short or open.
Failure Point
Printed wire broke between I305 and P305.
ACER X193HQ 23
Go to cover page